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    Variable Localized Bit-Depth Increase for Fixed-Point Transforms in Video Coding
    1.
    发明申请
    Variable Localized Bit-Depth Increase for Fixed-Point Transforms in Video Coding 有权
    视频编码中定点变换的可变局部位深增加

    公开(公告)号：US20120014455A1

    公开(公告)日：2012-01-19

    申请号：US13159063

    申请日：2011-06-13

    申请人： Rajan L. Joshi ,  Wei-Jung Chien ,  Marta Karczewicz ,  Yuriy Reznik ,  Peisong Chen ,  Hsiao-Chiang Chuang

    发明人： Rajan L. Joshi ,  Wei-Jung Chien ,  Marta Karczewicz ,  Yuriy Reznik ,  Peisong Chen ,  Hsiao-Chiang Chuang

    IPC分类号： H04N7/30

    CPC分类号： H04N19/42 ,  H04N19/122 ,  H04N19/157 ,  H04N19/176 ,  H04N19/184 ,  H04N19/196 ,  H04N19/46 ,  H04N19/60 ,  H04N19/61

    摘要： This disclosure describes techniques for mitigating rounding errors in a fixed-point transform associated with video coding by applying a variable localized bit-depth increase at the transform. More specifically, the techniques include selecting a constant value based on a size of a fixed-point transform in a video coding device and applying a variable localized bit-depth increase at the transform with a value equal to the constant value. Applying the variable localized bit-depth increase includes left-shifting a transform input signal by a number of bits equal to the constant value before the fixed-point transform, and right-shifting a transform output signal by a number of bits equal to the constant value after the fixed-point transform. The constant value is selected from a plurality of constant values stored on the video coding device. Each of the constant values is pre-calculated for one of a plurality of different transform sizes supported by the video coding.

    摘要翻译： 本公开描述了通过在变换处应用可变局部位深增加来减轻与视频编码相关联的定点变换中的舍入误差的技术。 更具体地，这些技术包括基于视频编码装置中的定点变换的大小来选择常数值，并且在变换时以等于常数值的值应用可变的局部位深增加。 应用可变局部位置深度增加包括将变换输入信号左移到等于定点变换之前的常数值的位数，并且将变换输出信号右移到等于常数的位数 定点变换后的值。 从存储在视频编码装置上的多个常数值中选择常数值。 对于由视频编码支持的多个不同的变换大小之一，预先计算每个常数值。

    VIDEO CODING USING DIRECTIONAL TRANSFORMS
    3.
    发明申请
    VIDEO CODING USING DIRECTIONAL TRANSFORMS 有权
    使用方向变换的视频编码

    公开(公告)号：US20120008682A1

    公开(公告)日：2012-01-12

    申请号：US13178427

    申请日：2011-07-07

    申请人： Marta Karczewicz ,  Muhammed Zeyd Coban ,  Peisong Chen ,  Hsiao-Chiang Chuang ,  Rajan L. Joshi

    发明人： Marta Karczewicz ,  Muhammed Zeyd Coban ,  Peisong Chen ,  Hsiao-Chiang Chuang ,  Rajan L. Joshi

    IPC分类号： H04N7/32

    CPC分类号： H04N19/61 ,  H04N19/11 ,  H04N19/122 ,  H04N19/129 ,  H04N19/13 ,  H04N19/132 ,  H04N19/14 ,  H04N19/157 ,  H04N19/159 ,  H04N19/176 ,  H04N19/194 ,  H04N19/196 ,  H04N19/46 ,  H04N19/593 ,  H04N19/60 ,  H04N19/85 ,  H04N19/96

    摘要： In one example, an apparatus for encoding video data includes a video encoder configured to calculate a residual block for a block of video data based on a predicted block formed using an intra-prediction mode, and transform the residual block using a transform mapped from the intra-prediction mode. In another example, an apparatus includes video encoder configured to receive an indication of a first intra-prediction mode in a first set of intra-prediction modes for a block of video data, determine a second intra-prediction mode from a second set of intra-prediction modes, smaller than the first set of intra-prediction modes, to which the first intra-prediction mode is mapped, determine a directional transform to which the second intra-prediction mode is mapped, and apply the directional transform to residual data of the block.

    摘要翻译： 在一个示例中，用于对视频数据进行编码的装置包括视频编码器，被配置为基于使用帧内预测模式形成的预测块来计算视频数据块的残差块，并且使用从 帧内预测模式。 在另一示例中，一种装置包括视频编码器，其被配置为在视频数据块的第一组帧内预测模式中接收第一帧内预测模式的指示，从第二组帧内预测模式中确定第二帧内预测模式 小于第一帧内预测模式映射的第一组帧内预测模式的预测模式确定映射了第二帧内预测模式的方向变换，并将定向变换应用于 块。

    Variable localized bit-depth increase for fixed-point transforms in video coding
    6.
    发明授权
    Variable localized bit-depth increase for fixed-point transforms in video coding 有权
    视频编码中定点变换的可变局部化位深增加

    公开(公告)号：US09185422B2

    公开(公告)日：2015-11-10

    申请号：US13159063

    申请日：2011-06-13

    申请人： Rajan L. Joshi ,  Wei-Jung Chien ,  Marta Karczewicz ,  Yuriy Reznik ,  Peisong Chen ,  Hsiao-Chiang Chuang

    发明人： Rajan L. Joshi ,  Wei-Jung Chien ,  Marta Karczewicz ,  Yuriy Reznik ,  Peisong Chen ,  Hsiao-Chiang Chuang

    IPC分类号： H04N7/12 ,  H04N19/42 ,  H04N19/176 ,  H04N19/46 ,  H04N19/196 ,  H04N19/122 ,  H04N19/61 ,  H04N19/60 ,  H04N19/157 ,  H04N19/184

    CPC分类号： H04N19/42 ,  H04N19/122 ,  H04N19/157 ,  H04N19/176 ,  H04N19/184 ,  H04N19/196 ,  H04N19/46 ,  H04N19/60 ,  H04N19/61

    摘要： This disclosure describes techniques for mitigating rounding errors in a fixed-point transform associated with video coding by applying a variable localized bit-depth increase at the transform. More specifically, the techniques include selecting a constant value based on a size of a fixed-point transform in a video coding device and applying a variable localized bit-depth increase at the transform with a value equal to the constant value. Applying the variable localized bit-depth increase includes left-shifting a transform input signal by a number of bits equal to the constant value before the fixed-point transform, and right-shifting a transform output signal by a number of bits equal to the constant value after the fixed-point transform. The constant value is selected from a plurality of constant values stored on the video coding device. Each of the constant values is pre-calculated for one of a plurality of different transform sizes supported by the video coding.

    摘要翻译： 本公开描述了通过在变换处应用可变局部位深增加来减轻与视频编码相关联的定点变换中的舍入误差的技术。 更具体地，这些技术包括基于视频编码装置中的定点变换的大小来选择常数值，并且在变换时以等于常数值的值应用可变的局部位深增加。 应用可变局部位置深度增加包括将变换输入信号左移到等于定点变换之前的常数值的位数，并且将变换输出信号右移到等于常数的位数 定点变换后的值。 从存储在视频编码装置上的多个常数值中选择常数值。 对于由视频编码支持的多个不同的变换大小之一，预先计算每个常数值。